What have I done wrong

Question

1.00/5 (1 vote)

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I programmed a calculator as an exercise, but I'm just nowhere near it (don't know what I did wrong). Can anyone help me?

What I have tried:

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
<link rel="preconnect" href="https://fonts.googleapis.com">
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
<link href="https://fonts.googleapis.com/css2?family=Montserrat:ital,wght@0,100;0,200;0,300;0,400;0,500;0,700;0,800;0,900;1,100;1,200;1,300;1,400;1,500;1,600;1,700;1,800;1,900&display=swap" rel="stylesheet">
    <style>
        body {
            font-family: 'Montserrat', sans-serif;
            margin: 0;
        }
        table {
            width: 100%;
            height: 70vh;
            color: white;
            background-color: rgb(25, 25, 25);
        }

        td {
            width: 25%;
            text-align: center;
            background-color: rgb(20, 20, 20);
            font-size: 24px;
        }

        td:hover {
            background-color: rgb(30, 30, 30);
            cursor: pointer;
        }

        #resultArea {
            height: 30vh;
            background-color: rgb(40, 40, 40);
            color: white;
            font-size: 64px;
            display: flex;
            justify-content: flex-end;
            align-items: flex-end;
            padding: 24px;
            box-sizing: border-box;
        }

        #result {
            background-color: rgb(67, 55, 236);
        }

        #result:hover {
            background-color: rgb(110, 101, 235);
        }

        .highlight {
            background-color: rgb(25, 25, 25);
        }
    </style>
    <script>

        function appendOperation(operation) {
            document.getElementById("resultArea").innerHTML =+ operation;
        }
    </script>
</head>

<body>
    <div id="resultArea">
        1234
    </div>


    <table>
        <tr>
            <td onclick="apperOperation(7)">7</td>
            <td>8</td>  
            <td>9</td>
            <td class="highlight">/</td>
        </tr>


        <tr>
            <td>4</td>
            <td>5</td>
            <td>6</td>
            <td class="highlight">x</td>
        </tr>


        <tr>
            <td>1</td>
            <td>2</td>
            <td>3</td>
            <td class="highlight">+</td>
        </tr>


        <tr>
            <td>0</td>
            <td>,</td>
            <td id="result">=</td>
            <td class="highlight">-</td>
        </tr>

    </table>
</body>

</html>

Posted 8-Jan-22 5:29am

爱Sakutq

Updated 8-Jan-22 6:59am

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Comments

0x01AA 8-Jan-22 11:37am

Have a look here and get some ideas: HTML | Calculator - GeeksforGeeks[^]
Btw. you tagged your question as java but it is more html and javascript ;)

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Luc Pattyn · Answer 1 · 2022-01-08T06:59:00

That is a lot of dead code (and a whole range of blackness). You took some care of how it looks, but you completely neglected functionality.
There is only a single onclick() and it refers to a non-existing function.

Suggestion: develop incrementally

step-by-step

start with a small piece of code (max 20 lines), focus on functionality
while (not done) {
     test and make sure its functionality is perfect (but incomplete)
     add some code and functionality
}
now do the same for layout and style: add some code
while (not done) {
     test and make sure what you added does what you intended
     add some more code and style 
}